Error opening file SD library

This is the output:

card initialized.
RTC has set the system time
New folder created with the name: 2017
Boot OK
NODE: cameraPC
Checking if the current year is changed...
Filename: /2017/Settembre.csv
WARNING: error opening the file!
Data read = 7.00 49.00
Data read = 73.00 58.00
Data read = 30.00 72.00
Data read = 44.00 78.00
Data read = 23.00 9.00
Checking if the current year is changed...
Filename: /2017/Settembre.csv
WARNING: error opening the file!
Data read = 40.00 65.00
Data read = 92.00 42.00
Data read = 87.00 3.00
Data read = 27.00 29.00
Data read = 40.00 12.00
Checking if the current year is changed...
Filename: /2017/Settembre.csv
WARNING: error opening the file!
Data read = 3.00 69.00
Data read = 9.00 57.00
Data read = 60.00 33.00
Data read = 99.00 78.00
Data read = 16.00 35.00
Checking if the current year is changed...
Filename: /2017/Settembre.csv
WARNING: error opening the file!
Data read = 97.00 26.00